JP2009124426A - Communication terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain sharing of a slot with surrounding communication terminals for a long time. <P>SOLUTION: Packets including frame information, travel direction information, speed information indicating communication states by a plurality of slots are received from the surrounding communication terminals, the travel direction of a self-terminal is acquired by a direction acquisition part 20, and travel speed of the self-terminal is acquired by a speed acquisition part 19. Then, a slot which can be shared with the surrounding communication terminals is extracted from the plurality of slots by a shared slot extraction part 30. Then, frame information similar to frame information on the self-terminal is transmitted among the extracted slots which can be shared by a time slot determination part 32, and a transmission time slot and a frame for transmitting the packets are determined so as to share a slot whose packet is transmitted from surrounding communication terminals in the travel direction where an angle formed with the travel direction of the self-terminal is within a predetermined range and at travel speed close to the travel speed of the self-terminal. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a communication terminal apparatus, and more particularly, to a communication terminal apparatus that multiplexes packets transmitted from peripheral communication terminal apparatuses and transmits packets.

  Conventionally, a time division multiple access (TDMA) system is known as one of communication systems. This TDMA method is a communication method in which one information transmission path is shared by a plurality of communication terminal devices, and communication information is transmitted from each communication terminal device by turns for a short time.

  For example, there is known a communication terminal device that time-divides a frame that is repeated at a predetermined cycle with one or more peripheral terminals into a plurality of slots and broadcasts data in slot units (Patent Document 1).

It is also known to determine a transmission slot so that the transmission slot is shared by a plurality of communication terminal devices in order to improve transmission efficiency.
JP2007-28550

  However, in the prior art, when determining the transmission slot so as to share the slot, the following problems occur because the position of the sharing partner and the state of movement are not considered.

  For example, when a slot is shared with a communication terminal device existing at the end of the communication area of the own device, it is highly likely that the sharing partner will immediately move out of the communication area due to the movement of the communication terminal device, so that the slot can be shared in a short time. There is a problem that it will not be established. In addition, when a slot is shared with a communication terminal device that moves differently from the own device, the sharing partner will eventually move out of the communication area of the own device over time, so the slot sharing is maintained for a long time. There is a problem that can not be.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a communication terminal device that can maintain long sharing of slots with peripheral communication terminal devices.

In order to achieve the above object, a communication terminal device according to a first aspect of the present invention is periodically transmitted from a peripheral communication terminal device with each of a plurality of slots obtained by time-dividing frames of a predetermined period as a unit, and , A transmission period that is a ⁿ times (n = 0, 1, 2,..., A is a natural number of 2 or more) of the predetermined period related to transmission by the peripheral communication terminal devices, and a transmission that indicates the communication status by the plurality of slots. Based on the transmission information of the packet received by the reception means for receiving the packet including information, the peripheral movement direction acquisition means for acquiring the movement direction of the peripheral communication terminal apparatus relative to the movement direction of the own apparatus, and the reception means Extracting means for extracting a slot that can be shared with the peripheral communication terminal device from the plurality of slots, and the transmission information of the packet received by the receiving means, Based on the movement direction acquired by the peripheral movement direction acquisition means, among the extracted sharable slots, the angle formed by the movement direction of the own device is within a predetermined range. A slot and a frame for transmitting the packet are determined so that the slot in which the packet is transmitted from the peripheral communication terminal apparatus is shared with the peripheral communication terminal apparatus in the moving direction within the predetermined range. Determining means for transmitting, and transmitting means for periodically transmitting the packet in the frame and slot determined by the determining means.

  According to the communication terminal device of the first invention, the reception unit periodically transmits the plurality of slots obtained by time-dividing the frames of the predetermined period from the peripheral communication terminal device as a unit, and the peripheral A packet containing transmission information indicating a transmission cycle related to transmission by the communication terminal device and communication statuses of a plurality of slots is received. Further, the movement direction of the peripheral communication terminal apparatus with respect to the movement direction of the own apparatus is acquired by the peripheral movement direction acquisition means.

  Then, based on the transmission information of the packet received by the receiving unit, the extracting unit extracts a slot that can be shared with surrounding communication terminal devices from a plurality of slots. Then, based on the transmission information of the packet received by the receiving unit by the determining unit and the moving direction acquired by the peripheral moving direction acquiring unit, the moving direction of the own device among the sharable slots extracted The packet is transmitted so that the slot in which the packet is transmitted from the peripheral communication terminal device in the moving direction within the predetermined range is shared with the communication terminal device in the moving direction within the predetermined range. A slot and a frame to be used are determined.

  Then, the transmission unit periodically transmits the packet to the frame and slot determined by the determination unit.

  In this way, by sharing a slot with a peripheral communication terminal device in the moving direction whose angle with the moving direction of the own device is within a predetermined range, even if the communication terminal device moves, the slot with the peripheral communication terminal device Can be shared for a long time.

  Here, the direction of movement within the predetermined range of the angle formed can be the same direction of movement of the traffic flow corresponding to the direction of movement. As a result, even if the moving direction is slightly different at the time of lane change or the like, the slot can be shared with a communication terminal device in the same moving direction as the traffic flow.

A communication terminal device according to a second aspect of the present invention is periodically transmitted from a peripheral communication terminal device by using each of a plurality of slots obtained by time-dividing frames for a predetermined period as a unit, and by the peripheral communication terminal device Transmission information indicating a transmission period of a ⁿ times (n = 0, 1, 2,..., A is a natural number greater than or equal to 2) of the predetermined period related to transmission and communication status by the plurality of slots, and the peripheral communication terminals Based on the receiving means for receiving a packet including movement direction information indicating the moving direction of the apparatus, the moving direction acquisition means for acquiring the moving direction of the own apparatus, and the transmission information of the packet received by the receiving means, Extraction means for extracting a slot that can be shared with the peripheral communication terminal device from a plurality of slots, the transmission information of the packet received by the reception means, and the moving direction Based on the information and the movement direction acquired by the movement direction acquisition unit, an angle formed by the movement direction acquired by the movement direction acquisition unit among the extracted sharable slots is predetermined. The packet is transmitted so that a slot in which the packet is transmitted from the peripheral communication terminal device in the moving direction within the range is shared with the peripheral communication terminal device in the moving direction within the predetermined range. A determination unit for determining a slot and a frame for transmission, and a transmission unit for periodically transmitting the packet to the frame and the slot determined by the determination unit.

  According to the communication terminal device according to the second invention, the receiving means periodically transmits each of a plurality of slots obtained by time-dividing a frame of a predetermined period from the surrounding communication terminal device as a unit, and A packet including transmission information related to transmission by the communication terminal device and transmission information indicating the communication status of the plurality of slots and movement direction information indicating the movement direction of the surrounding communication terminal devices is received. Further, the movement direction acquisition means acquires the movement direction of the own apparatus.

  Then, based on the transmission information of the packet received by the receiving unit, the extracting unit extracts a slot that can be shared with surrounding communication terminal devices from a plurality of slots. Then, the determination unit acquires the movement direction out of the sharable slots extracted based on the transmission information and movement direction information of the packet received by the reception unit and the movement direction acquired by the movement direction acquisition unit. A slot in which a packet is transmitted from a peripheral communication terminal device in the moving direction within an angle defined by the moving direction acquired by the means, and a peripheral communication terminal device in the moving direction within an angle defined within the predetermined range The slot and frame for transmitting the packet are determined so as to be shared.

  Then, the transmission unit periodically transmits the packet to the frame and slot determined by the determination unit.

  In this way, by sharing a slot with a peripheral communication terminal device in the moving direction whose angle with the moving direction of the own device is within a predetermined range, even if the communication terminal device moves, the slot with the peripheral communication terminal device Can be shared for a long time.

  The communication terminal apparatus according to the second invention further includes speed acquisition means for acquiring the movement speed of the own apparatus, and the reception means is a movement speed indicating transmission information, movement direction information, and movement speeds of surrounding communication terminal apparatuses. The determination unit receives the packet including the information, and the determination unit acquires the transmission information, movement direction information, and movement speed information of the packet received by the reception unit, the movement direction acquired by the movement direction acquisition unit, and the speed acquisition unit. The moving speed obtained by the speed obtaining means among the communication terminal devices in the moving direction whose angle formed by transmitting the packet to the extracted shareable slot is within the predetermined range based on the obtained moving speed Packets are transmitted so that the slots in which packets are transmitted from peripheral communication terminal devices with the closest moving speed are shared with the peripheral communication terminal devices with the closest moving speed. It can determine the slot and frame for transmitting. As a result, the communication terminal device can share a slot with a communication terminal device in the vicinity where the angle formed with the moving direction of the own device is within a predetermined range and the moving speed is closest to the own device. Even if it moves, sharing of slots with surrounding communication terminal devices can be maintained longer.

  The communication terminal apparatus according to the second invention further includes speed acquisition means for acquiring the movement speed of the own apparatus, and the reception means is a movement speed indicating transmission information, movement direction information, and movement speeds of surrounding communication terminal apparatuses. The determination unit receives the packet including the information, and the determination unit acquires the transmission information, movement direction information, and movement speed information of the packet received by the reception unit, the movement direction acquired by the movement direction acquisition unit, and the speed acquisition unit. The moving speed obtained by the speed obtaining means among the communication terminal devices in the moving direction whose angle formed by transmitting the packet to the extracted shareable slot is within the predetermined range based on the obtained moving speed A slot in which a packet is transmitted from a communication terminal device having a moving speed within a predetermined range is shared with a communication terminal device having a moving speed within a predetermined range. In so that it is possible to determine the slot and frame for transmitting a packet. As a result, the communication terminal apparatus can share a slot with a communication terminal apparatus in the vicinity of which the angle formed with the moving direction of the own apparatus is within a predetermined range and the difference in moving speed with the own apparatus is small. Even if the mobile terminal moves, the slot sharing with the surrounding communication terminal devices can be maintained for a longer time.

A communication terminal device according to a third aspect of the present invention is periodically transmitted from a peripheral communication terminal device by using each of a plurality of slots obtained by time-dividing frames for a predetermined period as a unit, and by the peripheral communication terminal device. Reception for receiving a packet including a transmission period that is a ⁿ times (n = 0, 1, 2,..., A is a natural number of 2 or more) of the predetermined period related to transmission and transmission information indicating the communication status of the plurality of slots. And a peripheral distance acquisition unit that acquires a distance between the device and the peripheral communication terminal device, and the peripheral communication from the plurality of slots based on the transmission information of the packet received by the reception unit. Extraction means for extracting a slot that can be shared with the terminal device, the transmission information of the packet received by the reception means, and the distance acquired by the peripheral distance acquisition means Based on the above, among the extracted sharable slots, a slot in which the peripheral communication terminal apparatus transmitting a packet whose distance acquired by the peripheral distance acquisition unit is a predetermined distance is defined as the predetermined slot. A determination unit that determines a slot and a frame for transmitting the packet so as to be shared with the surrounding communication terminal apparatuses that are distances, and the packet is periodically inserted into the frame and the slot determined by the determination unit. And transmitting means for transmitting.

  According to the communication terminal apparatus according to the third invention, the reception means periodically transmits the plurality of slots obtained by time-dividing the frames of the predetermined period from the peripheral communication terminal apparatus as a unit, and the peripheral A packet containing transmission information indicating a transmission cycle related to transmission by the communication terminal device and communication statuses of a plurality of slots is received. In addition, the peripheral distance acquisition unit acquires the distance between the own device and the peripheral communication terminal device.

  Then, based on the transmission information of the packet received by the receiving means, a slot that can be shared with surrounding communication terminal devices is extracted from the plurality of slots. Then, based on the transmission information of the packet received by the receiving unit and the distance acquired by the peripheral distance acquiring unit, the determining unit acquires the sharable slot extracted by the peripheral distance acquiring unit. A slot and a frame for transmitting a packet are determined so that a slot where a peripheral communication terminal apparatus having a predetermined distance transmits a packet is shared with a peripheral communication terminal apparatus having a predetermined distance.

  Then, the transmission unit periodically transmits the packet to the frame and slot determined by the determination unit.

  In this way, by sharing a slot with a peripheral communication terminal device that is close to the position of its own device, it is possible to maintain long sharing of the slot with the peripheral communication terminal device even if the communication terminal device moves. it can.

According to a fourth aspect of the present invention, there is provided a communication terminal device which is periodically transmitted from a peripheral communication terminal device by using each of a plurality of slots obtained by time-dividing frames for a predetermined period as a unit, and by the peripheral communication terminal device. Transmission information indicating a transmission period of a ⁿ times (n = 0, 1, 2,..., A is a natural number greater than or equal to 2) of the predetermined period related to transmission and communication status by the plurality of slots, and the peripheral communication terminals Based on the transmission information of the packet received by the receiving means, the receiving means for receiving the packet containing the position information indicating the position of the apparatus, the position acquiring means for acquiring the position of the own apparatus, from the plurality of slots , Extraction means for extracting a slot that can be shared with the peripheral communication terminal device, the transmission information and the position information of the packet received by the reception means, and the position acquisition Based on the position acquired by the means, the peripheral communication terminal apparatus at the position where the distance from the position acquired by the position acquisition means is a predetermined distance among the extracted sharable slots is a packet. Determining means for determining a slot and a frame for transmitting the packet so that the slot transmitting the packet is shared with the peripheral communication terminal device at the position of the predetermined distance, and determined by the determining means The frame and the slot include transmission means for periodically transmitting the packet.

  According to the communication terminal device of the fourth invention, the receiving means periodically transmits from the peripheral communication terminal device each of the plurality of slots obtained by time-dividing the frames of the predetermined period as a unit, and A packet including a transmission period related to transmission by the communication terminal device and transmission information indicating a communication state by a plurality of slots and position information indicating a position of a peripheral communication terminal device is received. In addition, the position acquisition unit acquires the position of the device itself.

  Then, based on the transmission information of the packet received by the receiving means, a slot that can be shared with surrounding communication terminal devices is extracted from the plurality of slots. Then, the determining unit acquires the sharable slot from among the extracted shareable slots based on the transmission information and position information of the packet received by the receiving unit and the position acquired by the position acquiring unit. For transmitting a packet so that the communication terminal device in the vicinity of the position where the distance to the predetermined position is transmitting the packet shares with the communication terminal device in the vicinity of the predetermined distance Determine slot and frame.

  Then, the transmission unit periodically transmits the packet to the frame and slot determined by the determination unit.

  In this way, by sharing a slot with a peripheral communication terminal device that is close to the position of its own device, it is possible to maintain long sharing of the slot with the peripheral communication terminal device even if the communication terminal device moves. it can.

  According to a fourth aspect of the present invention, there is provided a determination unit including: a peripheral communication terminal device transmitting a packet to the extracted shareable slot; a peripheral device having a position closest to the position acquired by the position acquisition unit; The slot and frame for transmitting the packet can be determined so that the slot in which the packet is transmitted from the communication terminal apparatus is shared with the nearby communication terminal apparatus in the nearest position. As a result, by sharing a slot with a peripheral communication terminal device that is closest to the position of the own device, even if the communication terminal device moves, the slot sharing with the peripheral communication terminal device can be maintained even longer. Can do.

  According to a fourth aspect of the present invention, the determining means includes a communication terminal apparatus that transmits a packet to the extracted sharable slot and has a distance within a predetermined range from the position acquired by the position acquiring means. The slot and frame for transmitting the packet can be determined so that the slot in which the packet is transmitted from the peripheral communication terminal apparatus is shared with the peripheral communication terminal apparatus at a position within a predetermined range. As a result, by sharing the slot with the peripheral communication terminal apparatus that is close to the position of the own apparatus, the slot sharing with the peripheral communication terminal apparatus can be maintained for a long time.

A communication terminal device according to a fifth aspect of the present invention is periodically transmitted from a peripheral communication terminal device by using each of a plurality of slots obtained by time-dividing frames for a predetermined period as a unit, and by the peripheral communication terminal device. Reception for receiving a packet including a transmission period that is a ⁿ times (n = 0, 1, 2,..., A is a natural number of 2 or more) of the predetermined period related to transmission and transmission information indicating the communication status of the plurality of slots. Means, a communication status acquisition means for acquiring a communication status observed in its own device by a plurality of slots in the receiving means, a communication status indicated by transmission information of a packet received by the receiving means, and the communication status acquisition means Based on the transmission information of the packet received by the receiving means, similarity calculating means for calculating the similarity with the communication status observed by the own device acquired by Extraction means for extracting a slot that can be shared with the peripheral communication terminal device from the plurality of slots, the transmission information of the packet received by the reception means, and the similarity calculated by the similarity calculation means Based on the degree, a packet is transmitted from the peripheral communication terminal device that has transmitted the transmission information in which the similarity with the communication status observed by the own device becomes a predetermined value among the extracted sharable slots. Determining means for determining a slot and a frame for transmitting the packet so as to be shared with the peripheral communication terminal device that has transmitted the transmission information having the predetermined value of the similarity, and the determining means The frame and the slot determined by (1) include transmission means for periodically transmitting the packet.

  According to the communication terminal device according to the fifth invention, the receiving means periodically transmits each of a plurality of slots obtained by time-dividing a frame of a predetermined period from the surrounding communication terminal device as a unit, and A packet containing transmission information indicating a transmission cycle related to transmission by the communication terminal device and communication statuses of a plurality of slots is received. In addition, the communication status acquisition unit acquires the communication status observed in the own device by the plurality of slots in the reception unit.

  Further, the similarity calculation unit calculates the similarity between the communication status indicated by the transmission information of the packet received by the reception unit and the communication status observed by the own apparatus acquired by the communication status acquisition unit.

  Then, based on the transmission information of the packet received by the receiving unit, the extracting unit extracts a slot that can be shared with surrounding communication terminal devices from a plurality of slots. Then, based on the transmission information of the packet received by the receiving unit by the determining unit and the similarity calculated by the similarity calculating unit, the communication status observed in the own device among the extracted sharable slots A slot in which a packet is transmitted from a peripheral communication terminal device that has transmitted transmission information with a predetermined similarity value is shared with a peripheral communication terminal device that has transmitted transmission information with a predetermined similarity value. Next, a slot and a frame for transmitting the packet are determined.

  Then, the transmission means periodically transmits the packet at the determined transmission cycle to the frame and slot determined by the determination means.

  In this way, by sharing a slot with a peripheral communication terminal device that has transmitted transmission information having a high degree of similarity to the communication status observed by the self device, the slot and the peripheral communication terminal device that are close to the self device are close. Therefore, even if the communication terminal device moves, it is possible to maintain a long slot sharing with surrounding communication terminal devices.

  The determining means according to the fifth invention provides transmission information having the highest degree of similarity to the communication status observed by the own device among the peripheral communication terminal devices that are transmitting packets to the extracted shareable slot. The slot and frame for transmitting a packet are determined so that the slot in which the packet is transmitted from the peripheral communication terminal apparatus that has transmitted is shared with the peripheral communication terminal apparatus that has transmitted the transmission information having the highest similarity. can do. As a result, the slot can be shared with a peripheral communication terminal apparatus that is the closest to the own apparatus, so that even if the communication terminal apparatus moves, the slot sharing with the peripheral communication terminal apparatus can be maintained longer. Can do.

  The determining means according to the fifth aspect of the invention transmits transmission information whose similarity with the communication status of the own device is a predetermined value or more among peripheral communication terminal devices that are transmitting packets to the extracted shareable slot. Determine the slot and frame for transmitting the packet so that the slot in which the packet is transmitted from the peripheral communication terminal apparatus is shared with the peripheral communication terminal apparatus that has transmitted the transmission information whose similarity is equal to or greater than the predetermined value. can do. As a result, slots can be shared with nearby communication terminal devices that are close to the device itself, so that even if the communication terminal device moves, the slot sharing with surrounding communication terminal devices can be maintained longer. it can.

  Based on the transmission information of the packet received by the receiving means, the above extracting means is configured so that the same slot as that from which the packet is transmitted from the peripheral communication terminal apparatus transmits the packet by the peripheral communication terminal apparatus. If the transmission cycle is the same as the transmission cycle determined by the local device and the transmission cycle determined by the own device and is different from the frame in which the peripheral communication terminal device is transmitting a packet, Can be extracted as a shareable slot.

  The determining means determines a slot in which a packet is transmitted from a peripheral communication terminal device serving as a sharing partner as a slot for transmitting the packet, and the peripheral communication terminal device serving as a sharing partner transmits the packet. A frame in which a slot determined in the same cycle as the transmission cycle is not used can be determined as a frame for transmitting a packet.

  As described above, according to the communication terminal device of the present invention, there is an effect that even if the communication terminal device moves, the slot sharing with the peripheral communication terminal device can be maintained for a long time.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. An example in which a wireless communication terminal device to which the present invention is applied is mounted on a moving mobile body such as a vehicle and wireless communication is performed by exchanging packets between the plurality of wireless communication terminal devices will be described. To do.

  As shown in FIG. 1, the mobile radio communication terminal apparatus 10 of the radio communication network according to the first embodiment transmits a packet transmitted from another mobile radio communication terminal apparatus 10 in the vicinity via a reception antenna 11. A receiving circuit 12 for receiving, a packet detecting unit 13 for detecting which time slot is used to transmit a received packet, a packet demodulating unit 14 for restoring transmitted data from the detected packet, and A frame information generation unit 15 that generates frame information to be described later to be embedded in a transmission packet based on the use state of the time slot in which the packet is detected by the packet detection unit 13 and the success or failure of the packet demodulation by the packet demodulation unit 14; Frame information included in the data demodulated by the unit 14 and the frame information generation unit 15 Similarity calculation unit 16 that calculates similarity to frame information, direction velocity detection unit 17 that detects movement direction information and velocity information included in the data demodulated by packet demodulation unit 14, and demodulation by packet demodulation unit 14 Frame information and transmission period information included in the received data, frame information generated by the frame information generation unit 15, similarity calculated by the similarity calculation unit 16, movement direction information detected by the direction speed detection unit 17, and An information storage unit 18 that stores speed information for a predetermined frame period, a speed acquisition unit 19 that acquires a movement speed from a speed sensor or the like (not shown) provided in a mobile body on which the device is mounted, A direction acquisition unit 20 that acquires a moving direction from a GPS or the like (not shown) provided on a mobile body equipped with the device, and each of the information stored in the information storage unit 18 A transmission slot determining unit 21 that determines a transmission time slot and a frame, which are time slots for transmitting a packet, based on the information, the moving speed acquired by the speed acquiring unit 19, and the moving direction acquired by the direction acquiring unit 20. ing.

  In addition, the mobile radio communication terminal device 10 includes a packet generation unit 22 that generates a packet, a transmission timing control unit 23 that controls the transmission timing of the packet, and a transmission circuit 24 that transmits the packet via the transmission antenna 25. In addition.

  The similarity calculation unit 16 includes frame information indicating communication status observed by another mobile radio communication terminal device 10 included in the data demodulated by the packet demodulation unit 14, and generated by the frame information generation unit 15. The degree of similarity (or degree of correlation) with the frame information indicating the communication status observed by the own device is calculated. Note that the calculated similarity indicates the similarity between the communication status indicated by the frame information from another mobile radio communication terminal apparatus 10 and the communication status indicated by the frame information generated by the own apparatus.

  Here, the principle of the present embodiment will be described. The mobile radio communication terminal apparatus 10 transmits the observed communication status of packets from the peripheral mobile radio communication terminal apparatus 10 as frame information. The mobile radio communication terminal apparatus 10 that receives the frame information also observes the communication status of the packets from the mobile radio communication terminal apparatuses 10 around the own apparatus, and holds the same frame information. At this time, when the mobile radio communication terminal apparatus 10 that transmits frame information and the mobile radio communication terminal apparatus that receives the frame information exist at a short distance of several meters to several tens of meters, both mobile radio communications The communication status observed by the terminal device is similar. That is, the correlation between the frame information transmitted by the mobile radio communication terminal apparatus 10 and the frame information held by the mobile radio communication terminal apparatus 10 that has received the frame information is increased.

  Therefore, when the mobile radio communication terminal apparatus 10 receives a packet, the correlation (similarity) between the frame information received from the surrounding mobile radio communication terminal apparatus 10 and the frame information held by the self apparatus is checked. Thus, it is possible to determine whether or not the mobile radio communication terminal apparatus 10 that has transmitted the frame information exists at a short distance from the mobile radio communication terminal apparatus 10 that has received the frame information.

  For example, as shown in FIG. 2, if the communication status indicated by the frame information received from another mobile radio communication terminal device 10 is similar to the communication status observed by the own device, the frame information is transmitted. It can be determined that the distance between the position of the other mobile radio communication terminal apparatus 10 and the position of the own apparatus is short. On the other hand, if the communication status indicated by the frame information received from the other mobile radio communication terminal apparatus 10 is not similar to the communication status observed by the own apparatus, the other mobile radio communication that transmitted the frame information It can be determined that the distance between the position of the terminal device 10 and the position of its own device is long.

  Therefore, transmission slot determination unit 21 of mobile radio communication terminal apparatus 10 according to the present embodiment determines a transmission time slot and a frame based on the similarity calculated by similarity calculation unit 16. As shown in FIG. 3, the transmission slot determination unit 21 includes a transmission cycle determination unit 34 that determines a packet transmission cycle based on various types of information stored in the information storage unit 18, and the information stored in the information storage unit 18. Based on various information and the determined transmission cycle information, shared slot extraction unit 30 that extracts a sharable slot, various information stored in information storage unit 18, extraction result of shared slot extraction unit 30, speed acquisition unit And a time slot determining unit 32 that determines a time slot and a frame to be used for packet transmission based on the moving speed from 19 and the moving direction from the direction acquiring unit 20.

  The shared slot extraction unit 30 stores the frame information generated by the frame information generation unit 15 stored in the information storage unit 18, the transmission cycle of the own device obtained by the transmission cycle determination unit 34, and the other terminal transmission cycle information. Based on this, it is determined whether there is a shareable slot. Here, slot sharing means that, as shown in FIG. 4, a plurality of mobile radio communication terminal devices 10 existing in a communication area have the same period and slots of the same number in different frames. It means to use. The mobile radio communication terminal apparatuses 10 sharing the slots transmit packets alternately using the same numbered slots. For example, another mobile radio communication (see B to D in FIG. 4) transmits a packet to the slot of number (2) with a period that is four times the basic period and in a different frame. In this case, the own apparatus (see A in FIG. 4) is a frame having a period four times the basic period in the slot of the same number (2) and a frame different from that of the other mobile radio communication terminal apparatus 10 By transmitting the packet, the slot of number (2) is shared.

  Further, the configuration of a frame transmitted / received by the mobile radio communication terminal apparatus 10 will be described with reference to FIG. One frame is set to 100 ms, for example, and the frame period is periodically repeated. Each frame period is composed of n time slots divided into n (eight in this embodiment) periods. This one time slot indicates a period during which one packet can be transmitted. In the mobile radio communication terminal device 10, packets are exchanged in units of this time slot. One frame period may be set in accordance with the data transmission period of each mobile radio communication terminal apparatus 10. For example, in order to guarantee the transmission of a packet once every 100 ms in each mobile radio communication terminal device 10, it may be set to 100 ms. In mobile radio communication terminal apparatus 10 according to the present embodiment, it is assumed that the frame period is 100 ms.

In addition, mobile radio communication terminal apparatus 10 according to the present embodiment sets the transmission cycle for transmitting packets to any of 2 ⁿ times the frame cycle (n = 0, 1, 2,...). In this embodiment, the transmission cycle can be set to any one of four times (basic cycle), two times, four times, and eight times the frame cycle. .

  The packet includes header information, frame information indicating a use state of a time slot in one frame period detected by the mobile radio communication terminal apparatus 10 that transmitted the packet, and a transmission indicating a transmission period in which the packet is transmitted. It has period information, a data area including actual data to be transmitted, and a guard time for reducing the influence of the time slot synchronization error. In the present invention, the time slot synchronization method is not limited, but it is assumed that the synchronization can be compensated by the guard time by some means such as providing a reference station for synchronization. In this embodiment, frame information and transmission cycle information are used as transmission information included in the packet.

  The frame information is provided with areas corresponding to the number of time slots, and a value indicating the usage state of each time slot is set in each area. In the frame information according to the present embodiment, eight regions [S1, S2,..., S8] are provided corresponding to eight time slots. In each area of the frame information, a value indicating one of “FREE” (empty), “ACK” (reception success), “NACK” (reception failure), and “RTC” (collision occurrence) is set. “FREE” indicates that a packet is not received and unused in the target time slot. “ACK” indicates that the packet has been successfully received in the target time slot. Note that the successful reception of a packet means that the information in the packet could be demodulated as well as the packet received / detected. “NACK” indicates that the reception of the packet has failed in the target time slot, and indicates that the packet has been received and detected, but the information in the packet could not be demodulated. “RTC” indicates that a packet has collided.

  In addition, the transmission cycle information according to the present embodiment is a 3-bit area. When the transmission cycle for transmitting a packet is one time the frame cycle, “000” is set, and the transmission cycle for transmitting the packet Is set to “001”, and when the transmission period for transmitting the packet is four times the frame period, “010” is set, and the transmission period for transmitting the packet is eight times the frame period. In this case, “011” is set.

  The actual data in the data area includes speed information indicating the moving speed of the moving object acquired by the speed acquiring unit 19 and direction information indicating the moving direction of the moving object acquired by the direction acquiring unit 20.

  The mobile radio communication terminal apparatus 10 of the radio communication network configured as described above operates as follows each time a packet transmitted from another mobile radio communication terminal apparatus 10 is received.

  The packet detection unit 13 detects in which time slot the packet is transmitted based on the reception time of the packet received by the reception circuit 12. The packet demodulator 14 demodulates the detected packet and restores the data transmitted from the other mobile radio communication terminal apparatus 10.

  The frame information generation unit 15 performs “FREE” for a time slot that has not received a packet, “ACK” for a time slot that has successfully received a packet, The frame information is generated as “NACK” for the time slot in which reception failed and “RTC” for the time slot in which the packet collided.

  The similarity calculation unit 16 extracts frame information [S1, S2,..., S8] of other mobile wireless communication terminal devices 10 included in the data from the data demodulated by the frame information generation unit 15, The similarity between the extracted frame information and the frame information generated by the frame information generation unit 15 is calculated. In this embodiment, for each time slot, the frame information is composed of 0 and 1 with 0 being “FREE” and 1 being “ACK”, “NACK”, or “RTC”. The degree of coincidence of the converted data string is calculated as the similarity of the frame information.

  The direction speed detection unit 17 extracts the speed information and direction information of the other mobile radio communication terminal apparatus 10 included in the data from the data demodulated by the packet demodulation unit 14.

  The information storage unit 18 uses the data demodulated by the packet demodulation unit 14 to obtain frame information [S1, S2,..., S8] and transmission cycle information of other mobile radio communication terminal devices 10 included in the data. The extracted frame information is used as the other terminal frame information, the extracted transmission cycle information is used as the other terminal transmission cycle information, and information indicating the received time slot is attached, and a predetermined frame cycle is sequentially stored from the newest one. . The information storage unit 18 stores the frame information generated by the frame information generation unit 15 as the self-terminal frame information for the predetermined frame period in order from the newest one. Further, the information storage unit 18 stores the similarity calculated by the similarity calculation unit 16 with the information indicating the received time slot, and sequentially stores the predetermined frame period from the newest one. In addition, the information storage unit 18 uses the speed information and direction information detected by the direction speed detection unit 17 as other terminal speed information and other terminal direction information, and adds information indicating the received time slot. The predetermined frame period is sequentially stored.

  In mobile radio communication terminal apparatus 10 according to the present embodiment, since the longest transmission cycle is eight times the frame cycle, information storage unit 18 stores data for eight frame cycles, respectively. And

  The transmission slot determination unit 21 includes other terminal frame information, other terminal transmission cycle information, own terminal frame information, similarity, other terminal speed information, and other terminal direction information for the predetermined frame period accumulated in the information accumulation unit 18. Based on the movement speed from the speed acquisition unit 19 and the movement direction from the direction acquisition unit 20, the transmission period of the packet is determined, and the transmission time slot and frame used for packet transmission are determined.

  Specifically, the transmission time slot determination processing routine shown in FIG. 6 is executed to determine the transmission time slot and frame.

  First, in step 98, for example, the packet transmission cycle is determined according to the usage rate of a plurality of slots. For example, when the slot usage rate is high, a long transmission cycle is determined, and when the slot usage rate is low, a short transmission cycle is determined. The packet transmission cycle may be determined according to conditions other than the slot usage rate. For example, the packet transmission cycle may be determined according to the moving speed of the device itself.

  In step 100, slots that can be shared in the determined transmission cycle are extracted from the plurality of slots. In step 100, for each time slot, the use state of the time slot is determined based on each of the other terminal frame information and the own terminal frame information for the predetermined frame period, and at least one of the use states is “ACK”, “NACK” ”And“ RTC ”, it is determined that the time slot is being used by another mobile radio communication terminal apparatus 10, and“ FREE ”is displayed in all the usage states. As for the time slot, it is determined that the time slot is an empty time slot (a time slot not used by any mobile radio communication terminal apparatus 10).

  Then, the same slot as that used for the other mobile radio communication terminal apparatus 10 includes the transmission cycle in which the other mobile radio communication terminal apparatus 10 transmits a packet and the transmission cycle determined in step 98. If the frame has the same cycle and is different from a frame in which another mobile radio communication terminal apparatus 10 is transmitting a packet and is not used, it is determined that the slot can be shared. To do. The above determination is made for all slots determined to be used by other mobile radio communication terminal apparatuses 10.

  In the next step 102, it is determined whether or not a sharable slot exists based on the extraction result in step 100. If there is no sharable slot, in step 104, an empty time slot is determined. From among them, for example, a transmission time slot used for packet transmission is determined at random, and the transmission time slot determination processing routine is terminated. In addition, when there are a plurality of empty time slots, for example, the time slots may be used in order from the earliest timing within one frame period, or may be used in the order from the later timing within one frame period. .

  On the other hand, if it is determined in step 102 that there is a shareable slot, the moving speed and moving direction of the own apparatus are acquired in step 108. In step 110, the similarity, the other terminal speed information, and the other terminal direction information stored in the information storage unit 18 and the movement speed and direction of the own apparatus acquired in step 108 are set. Based on the sharable slots extracted in step 100, the transmission time slot of the own terminal is determined.

  In step 110 described above, each of the other terminal direction information of the mobile radiocommunication terminal device 10 transmitting the packet to the extracted shareable slot is compared with the movement direction of the own device, and the movement of the own device is compared. The other mobile radio communication terminal apparatus 10 in which the angle formed with the direction is the moving direction within a predetermined range extracts the slot transmitting the packet. Here, the movement direction in which the angle formed by the movement direction of the own apparatus is within a predetermined range is a movement direction in which the direction of the corresponding traffic flow is the same as the movement direction of the own apparatus.

  When there is one extracted slot, the extracted slot is determined as the time slot of the terminal itself. On the other hand, when there are a plurality of extracted slots, other mobile radios with a similarity greater than or equal to a predetermined value based on the similarity to the mobile radio communication terminal device 10 transmitting a packet to the extracted slot. The slot from which the communication terminal device 10 is transmitting a packet is extracted. When there is one extracted slot, the extracted slot is determined as the time slot of the terminal itself.

  On the other hand, when there are a plurality of extracted slots, the other terminal speed information of the mobile radio communication terminal apparatus 10 transmitting the packet to the extracted slot is compared with the moving speed of the own apparatus, A slot in which another mobile radio communication terminal apparatus 10 having a moving speed closest to the moving speed of the apparatus is transmitting a packet is determined as a time slot of the own terminal.

  In the next step 112, the time slot determined in step 110 is unused in the same cycle as the transmission cycle of the mobile radio communication terminal apparatus 10 as the sharing partner, that is, in the transmission cycle determined in step 98. The timing frame is determined as the frame of the terminal itself, and the transmission time slot determination processing routine ends.

  When the above transmission time slot determination processing routine is executed, for example, as shown in FIG. 7, a slot of number (2) or (4) is searched for as a shareable slot. Of the other mobile radiocommunication terminal devices 10 that are transmitting packets to the searched slot, any one of the terminals B, C, and D has an angle formed with the moving direction of the own device within a predetermined range. If the similarity of the frame information is equal to or greater than a predetermined value and the moving speed is close to the own apparatus, the slot with the number (2) is determined as the time slot of the own terminal. In addition, a frame having the same length as the transmission cycle of terminals B, C, and D (four times the basic cycle in FIG. 7) and a timing at which the determined time slot is not used is determined as the frame of the terminal itself. Is done.

  When the transmission time slot is determined in this way, as shown in FIG. 8, a plurality of mobile radio communication terminal apparatuses that move in the same direction at close speeds and are close to each other share the same slot. As a result, even if the mobile radio communication terminal apparatus moves, the slot sharing relationship continues for a long time.

  The packet generation unit 22 generates a packet in which the period information indicating the packet transmission period determined by the transmission slot determination unit 21 and the frame information generated by the frame information generation unit 15 are embedded. The transmission timing control unit 23 controls the transmission circuit 24 to transmit a packet to the time slot determined by the transmission slot determination unit 21 at the determined frame timing. The transmission circuit 24 transmits the packet generated by the packet generation unit 22 via the transmission antenna 25 in accordance with control from the transmission timing control unit 23.

  Also, the transmission slot determination unit 21 executes the above-described transmission slot determination processing routine even when the transmission time slot is changed.

  As described above, according to the mobile radio communication terminal apparatus according to the first embodiment, the angle formed with the moving direction of the own apparatus is a moving direction within a predetermined range, and the moving apparatus moves with the own apparatus. By sharing the slot with a peripheral mobile radio communication terminal apparatus having a small speed difference, the slot sharing with the peripheral mobile radio communication terminal apparatus can be maintained for a long time.

  In addition, by sharing a slot with a peripheral mobile radio communication terminal device that has transmitted frame information having a high degree of similarity to the frame information generated by the own device, a peripheral mobile radio communication terminal having a short distance from the own device Since the slot can be shared with the apparatus, the sharing of the slot with the surrounding mobile radio communication terminal apparatus can be maintained for a long time.

  In addition, the mobile radio communication terminal apparatus can be moved by sharing a slot with a peripheral mobile radio communication terminal apparatus that is moving in the same manner as the self apparatus and is located at a distance close to the own apparatus. However, the state where the slot is shared continues for a long time. As a result, slot sharing is efficiently performed, and the slot can be reused.

  In addition, by referring to the direction information and speed information of other mobile radio communication terminal devices included in the packet received in each slot, other mobile radio communication terminal devices transmitting packets to each slot It is possible to grasp the state of movement and share a slot with a mobile radio communication terminal apparatus that moves in the same manner as the own apparatus.

  There is a function that feeds back the reception result of the packet received during the packet transmission event (frame information generated based on the received packet) to the other mobile wireless communication terminal device that sent the packet. As shown in FIG. 9A, the information to be performed is information for only one frame period (100 msec) immediately before packet transmission. When transmission cycle control is performed to make the transmission cycle longer than one frame cycle, the transmission cycle becomes longer as shown in FIG. 9B. Therefore, the reception result for one transmission cycle (for example, the transmission cycle is 800 msec) In this case, it is necessary to feed back frame information based on a packet received during 800 msec. However, even in this case, since only frame information corresponding to one frame period immediately before packet transmission is fed back, the remaining (transmission) The frame information for (cycle-1 frame period), for example, 700 msec (= 800 msec-100 msec) is not fed back to the mobile radio communication terminal apparatus that transmitted the packet. As a result, the mobile radio communication terminal apparatus cannot detect an event that adversely affects the protocol operation, such as a packet collision that has occurred, thereby preventing normal operation of the protocol.

  In addition, since the generated frame information largely depends on the position where the packet is received, the frame information indicating the communication status observed at a specific position in the mobile radio communication terminal apparatus is used as the mobile radio communication which transmitted the packet. It is necessary to tell the terminal device accurately. That is, when performing transmission cycle control, it becomes a problem to feed back frame information indicating a communication state observed at each position to another mobile radio communication terminal apparatus that has transmitted the packet without loss.

  In the present embodiment, by sharing the slot, frame information indicating the communication status of the packet observed in the mobile radio communication terminal device sharing the slot, even though the transmission cycle control is performed, It is possible to feed back to surrounding mobile radio communication terminal devices without loss. Also, based on packets received in a specific area where a plurality of mobile radio communication terminal devices exist by a plurality of mobile radio communication terminal devices existing in close distance sharing a slot and transmitting packets alternately The frame information can be fed back to the mobile radio communication terminal device existing at a short distance without loss.

  In the above embodiment, among the sharable slots, the slot in which the mobile radio communication terminal apparatus that transmitted the frame information whose similarity to the frame information of the own apparatus is a predetermined value or more transmits the packet. The case where the transmission time slot and the transmission cycle are determined so as to be shared has been described as an example. However, the present invention is not limited to this, and among the shareable slots, the similarity with the frame information of the own apparatus is the highest. The transmission time slot and the frame may be determined so that the mobile radio communication terminal apparatus that transmitted the frame information shares the slot transmitting the packet.

  In addition, a case where a transmission time slot and a frame are determined so that the mobile radio communication terminal apparatus having the smallest difference from the moving speed of the own apparatus among the sharable slots may share the slot transmitting the packet. Although described in the example, the present invention is not limited to this, and among the sharable slots, a mobile radio communication terminal device having a moving speed within a predetermined range of a difference from the moving speed of its own device transmits a packet. A transmission time slot and a frame may be determined so as to share a certain slot.

  Next, a mobile radio communication terminal apparatus according to the second embodiment will be described. In addition, about the part which becomes the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the second embodiment, based on the other terminal position information included in the packet transmitted from the other mobile radio communication terminal apparatus, the distance between the position of the surrounding mobile radio communication terminal apparatus and the position of the own apparatus. This is different from the first embodiment.

  As shown in FIG. 10, the mobile radio communication terminal apparatus 210 according to the second embodiment includes a reception circuit 12, a packet detection unit 13, a packet demodulation unit 14, a frame information generation unit 15, and a packet demodulation. Frame information, transmission period information, and frame information included in the data demodulated by the packet demodulator 14, a position information detector 216 that detects position information included in the data demodulated by the unit 14, a direction speed detector 17 An information storage unit 218 that stores the frame information generated by the generation unit 15, the position information detected by the position information detection unit 216, and the moving direction information and speed information detected by the direction speed detection unit 17 for a predetermined frame period; The position of the own device is acquired from the speed acquisition unit 19, the direction acquisition unit 20, and the GPS provided in the mobile body on which the own device is mounted. Based on various information stored in the position acquisition unit 220 and the information storage unit 218, the moving speed acquired by the speed acquisition unit 19, the moving direction acquired by the direction acquisition unit 20, and the position acquired by the position acquisition unit 220, A transmission time slot that is a time slot for transmitting a packet, and a transmission slot determination unit 221 that determines a frame.

  The time slot determination unit 32 of the transmission slot determination unit 221 includes the information stored in the information storage unit 218, the extraction result of the shared slot extraction unit 30, the movement speed from the speed acquisition unit 19, the movement direction from the direction acquisition unit 20, Based on the position from the position acquisition unit 220, a transmission time slot and a frame to be used for packet transmission are determined.

  The actual data in the data area of the packet includes speed information indicating the moving speed of the moving object acquired by the speed acquiring unit 19, direction information indicating the moving direction of the moving object acquired by the direction acquiring unit 20, and a position acquiring unit. Position information indicating the position of the moving object acquired by 220 is included.

  When the mobile radio communication terminal apparatus 210 of the radio communication network configured as described above receives a packet transmitted from another mobile radio communication terminal apparatus 210, the mobile radio communication terminal apparatus 210 operates as follows. Note that description of operations similar to those of the first embodiment is omitted.

  The position information detection unit 216 extracts position information of the other mobile radio communication terminal apparatus 210 included in the data from the data demodulated by the packet demodulation unit 14.

  The information accumulating unit 218 accumulates the frame information and the transmission cycle information of the other mobile radio communication terminal device 210 as the other terminal frame information and the other terminal transmission cycle information, respectively, for a predetermined frame period. The generated frame information is stored for a predetermined frame period as its own terminal frame information. Further, the information storage unit 218 stores the speed information and direction information detected by the direction speed detection unit 17 as other terminal speed information and other terminal direction information for a predetermined frame period.

  Further, the information storage unit 218 adds the information indicating the received time slot using the position information detected by the position information detection unit 216 as other terminal position information, and stores the predetermined frame period in order from the newest one. To do.

  The transmission slot determination unit 221 includes other terminal frame information, other terminal transmission cycle information, own terminal frame information, other terminal position information, other terminal speed information, and other terminals for the predetermined frame period accumulated in the information accumulation unit 218. Based on the direction information, the moving speed from the speed acquisition unit 19, the moving direction from the direction acquisition unit 20, and the position from the position acquisition unit 220, the packet transmission cycle is determined and used for packet transmission. The transmission time slot and frame to be determined are determined.

  A transmission time slot determination processing routine shown in FIG. 11 is executed to determine a frame and a transmission time slot. In addition, about the process similar to 1st Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  First, in step 98, the transmission cycle of the packet is determined, and in step 100, a slot that can be shared in the determined transmission cycle is extracted. In the next step 102, based on the extraction result of step 100, It is determined whether there is a sharable slot. If there is no sharable slot, in step 104, for example, a transmission time slot used for packet transmission is randomly selected from the empty time slots. To determine the transmission time slot determination processing routine.

  On the other hand, if it is determined in step 102 that there is a shareable slot, in step 250, the moving speed, moving direction, and position of the own apparatus are acquired. In step 252, the other terminal position information, other terminal speed information, and other terminal direction information for the predetermined frame period stored in the information storage unit 218, and the movement speed and movement of the own apparatus acquired in step 250. Based on the direction and position, the time slot of the terminal is determined from the shareable slots extracted in step 100.

  In step 252 described above, each of the other terminal direction information of the mobile radio communication terminal apparatus 10 that is transmitting the packet to the extracted shareable slot is compared with the movement direction of the own apparatus, and the movement of the own apparatus is compared. The other mobile radio communication terminal apparatus 210 having a direction in which the angle formed by the direction is within a predetermined range extracts the slot in which the packet is being transmitted. When there is one extracted slot, the extracted slot is determined as the time slot of the terminal itself.

  On the other hand, when there are a plurality of extracted slots, the other terminal position information of the mobile radio communication terminal apparatus 210 transmitting the packet to the extracted slot is compared with the position of the own apparatus, The other mobile wireless communication terminal apparatus 210 whose distance is within a predetermined range extracts the slot transmitting the packet. When there is one extracted slot, the extracted slot is determined as the time slot of the terminal itself.

  On the other hand, when there are a plurality of extracted slots, the other terminal speed information of the mobile radio communication terminal apparatus 210 transmitting the packet to the extracted slot is compared with the moving speed of the own apparatus, A slot in which another mobile radio communication terminal apparatus 210 having a moving speed closest to the moving speed of the apparatus is transmitting a packet is determined as a time slot of the own terminal.

  In the next step 112, the time slot determined in step 252 is not set in the same cycle as the transmission cycle of the mobile radio communication terminal apparatus 210 to be shared, that is, the same cycle as the transmission cycle determined in step 98. The frame of the timing to be used is determined as the frame of the own terminal, and the transmission time slot determination processing routine is ended.

  As described above, according to the mobile radio communication terminal apparatus according to the second embodiment, the mobile radio communication terminal apparatus and the slots around the mobile radio communication terminal apparatus in the vicinity where the distance from the position of the own apparatus is within a predetermined range. By sharing the slot, it is possible to share the slot with the surrounding mobile radio communication terminal apparatus that is close to the own apparatus, and thus it is possible to maintain the slot sharing with the surrounding mobile radio communication terminal apparatus for a long time. it can.

  In the above embodiment, among the sharable slots, mobile radio communication terminal devices that are located within a predetermined distance from the location of the own device share the slot transmitting the packet. In addition, the case where the transmission time slot and the frame are determined has been described as an example. However, the present invention is not limited to this, and the mobile object that is present in the closest position to the position of the own apparatus among the sharable slots The transmission time slot and the frame may be determined so that the wireless communication terminal apparatus shares the slot transmitting the packet.

  Next, a mobile radio communication terminal apparatus according to the third embodiment will be described. In addition, about the part which becomes the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the third embodiment, a slot is shared with other mobile radio communication terminal apparatuses that have a moving speed that has a small difference from the moving speed of the own apparatus within an angle formed by the moving direction of the own apparatus. Thus, the point which determines the transmission time slot of the own terminal and the point which does not consider the similarity of frame information differ mainly from 1st Embodiment.

  The mobile radio communication terminal apparatus according to the third embodiment stores frame information and transmission cycle information of other mobile radio communication terminal apparatuses in the information storage unit 18 as other terminal frame information and other terminal transmission period information. Each frame is stored for a predetermined frame period, and the frame information generated by the frame information generation unit 15 is stored for a predetermined frame period as its own terminal frame information. Further, the information storage unit 18 stores the speed information and direction information detected by the direction speed detection unit 17 as other terminal speed information and other terminal direction information for a predetermined frame period.

  The transmission slot determination unit 21 is a time slot that transmits a packet based on various information stored in the information storage unit 18, the moving speed acquired by the speed acquisition unit 19, and the moving direction acquired by the direction acquisition unit 20. A transmission time slot and a transmission cycle are determined.

  In the transmission time slot determination processing routine in the third embodiment, a packet transmission cycle is determined, a slot that can be shared in the determined transmission cycle is extracted from a plurality of slots, and a slot that can be shared is determined. If it exists, the moving speed and moving direction of its own device are acquired.

  Then, each of the other terminal direction information of the mobile radio communication terminal device that is transmitting the packet to the shareable slot is compared with the moving direction of the own device, and the angle formed by the moving direction of the own device is predetermined. A slot in which another mobile radio communication terminal device that is in the moving direction is transmitting a packet is extracted. If there is one extracted slot, the extracted slot is determined as the transmission time slot of the terminal itself.

  On the other hand, when there are a plurality of extracted slots, each of the other terminal speed information of the mobile radio communication terminal apparatus that is transmitting the packet to the extracted slot is compared with the moving speed of the own apparatus, A slot in which another mobile wireless communication terminal apparatus having a moving speed with the smallest difference from the moving speed of the own apparatus transmits a packet is determined as a transmission time slot of the own terminal.

  In addition, the frame of the timing at which the determined time slot is not used at the same cycle as the transmission cycle of the mobile radio communication terminal device of the sharing partner, that is, the same cycle as the determined transmission cycle, is Determine as a frame.

  When the transmission time slot is determined by the above transmission time slot determination processing routine, as shown in FIG. 12, a plurality of mobile radio communication terminal devices moving in the same direction at close movement speeds Share. As a result, even if the mobile radio communication terminal apparatus moves, the slot sharing relationship continues for a long time.

  Next, a mobile radio communication terminal apparatus according to the fourth embodiment will be described. In addition, about the part which becomes the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the fourth embodiment, the transmission time slot of the own terminal is determined so as to share the slot with other mobile radio communication terminal apparatuses having a communication situation similar to that of the own apparatus. This is mainly different from the first embodiment in that the moving direction and moving speed are not taken into consideration.

  The mobile radio communication terminal apparatus according to the fourth embodiment stores frame information and transmission cycle information of other mobile radio communication terminal apparatuses in the information storage unit 18 as other terminal frame information and other terminal transmission period information. Each frame is stored for a predetermined frame period, and the frame information generated by the frame information generation unit 15 is stored for a predetermined frame period as its own terminal frame information. Further, the information accumulating unit 18 accumulates the similarity calculated by the similarity calculating unit 16 for the predetermined frame period.

  The transmission slot determination unit 21 determines a transmission cycle based on various information stored in the information storage unit 18 and also determines a transmission time slot and a frame that are time slots for transmitting a packet.

  In the transmission time slot determination processing routine in the fourth embodiment, a packet transmission cycle is determined, and a slot that can be shared in the determined transmission cycle is extracted from a plurality of slots.

  Then, based on each of the similarities of the mobile radio communication terminal apparatus that is transmitting packets to the extracted sharable slot with respect to other terminal frame information, other mobile bodies that have transmitted the frame information with the highest similarity The slot in which the wireless communication terminal device is transmitting a packet is determined as the transmission time slot of its own terminal.

  In addition, the frame of the timing at which the determined time slot is not used at the same cycle as the transmission cycle of the mobile radio communication terminal device of the sharing partner, that is, the same cycle as the determined transmission cycle, is Determine as a frame.

  When a transmission time slot is determined by the above transmission time slot determination processing routine, as shown in FIG. 13, a plurality of mobile radio communication terminal devices existing at a short distance share the slot. As a result, even if the mobile radio communication terminal apparatus moves, the slot sharing relationship continues for a long time.

  As described above, a mobile radio communication in the vicinity of a nearby mobile radio communication terminal apparatus that shares a slot with a mobile radio communication terminal apparatus in the vicinity that transmits frame information having a high degree of similarity to the frame information generated by the self apparatus, and is close to the self apparatus. By sharing the slot with the terminal device, the sharing of the slot with the peripheral mobile radio communication terminal device can be maintained for a long time without the speed information and the direction information of the peripheral mobile radio communication terminal device.

  In the above-described embodiment, another mobile radio serving as a slot sharing partner is transmitted from another mobile radio communication terminal that transmits a packet to a shareable slot based on the similarity of frame information. The case of selecting a communication terminal device has been described as an example. However, the present invention is not limited to this, and based on the location information of the own device and the location information of other mobile radio communication terminal devices, the time slot can be shared. You may make it select the other mobile radio | wireless communication terminal device which becomes a slot sharing partner from the other mobile radio | wireless communication terminal device which is transmitting the packet. In this case, as in the second embodiment described above, the location of the own device is acquired from GPS or the like, and the location information of other mobile radio communication terminal devices is obtained from the actual data of the transmitted packet. What is necessary is just to detect.

  Next, a mobile radio communication terminal apparatus according to the fifth embodiment will be described. In addition, about the part which becomes the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The fifth embodiment is different from the first embodiment in that the moving direction of the surrounding mobile radio communication terminal apparatus and the distance from the own apparatus are detected based on the received signal power. .

  As shown in FIG. 14, the mobile radio communication terminal apparatus 510 according to the fifth embodiment includes a receiving circuit 12, a packet detecting unit 13, a packet demodulating unit 14, a frame information generating unit 15, and a receiving antenna. 11 based on the magnitude of the signal power received at 11, based on the magnitude of the signal power received at the receiving antenna 11, and a distance detection unit 516 that detects the distance between the mobile radio communication terminal device 510 in the vicinity and the own apparatus. A direction detecting unit 517 for detecting the moving direction of the surrounding mobile radio communication terminal apparatus 510 with respect to the moving direction of the own apparatus, frame information, transmission period information, and frame information included in the data demodulated by the packet demodulating unit 14 The frame information generated by the generation unit 15, the distance detected by the distance detection unit 516, and the movement direction detected by the direction detection unit 517 are set in a predetermined format. An information storage unit 518 for storing a frame period, and a transmission slot determination unit 521 for determining a transmission time slot and a frame as a time slot for transmitting a packet based on various information stored in the information storage unit 518. ing.

  The distance detection unit 516 observes the magnitude of the signal power received by the receiving antenna 11, and based on the observed magnitude of the signal power, the greater the signal power, the closer the mobile radio communication terminal device 510 in the vicinity. A near distance is detected as a distance to the own apparatus, and a far distance is detected as a distance between the surrounding mobile radio communication terminal apparatus 510 and the own apparatus as the signal power is smaller.

  The direction detection unit 517 observes the magnitude of the signal power received by the receiving antenna 11 for a predetermined period, and when the signal power decreases over time based on the observed change in the signal power during the predetermined period, As the moving direction of the surrounding mobile radio communication terminal apparatus 510 with respect to the moving direction of the own apparatus, a direction different from the moving direction of the own apparatus and away from the own apparatus is detected, and the signal power is increased as time passes. In the case of increasing, the moving direction of the surrounding mobile radio communication terminal apparatus 510 with respect to the moving direction of the own apparatus is different from the moving direction of the own apparatus and the direction approaching the own apparatus is detected. If the signal power does not change as time elapses, the moving direction of the surrounding mobile radio communication terminal apparatus 510 relative to the moving direction of the own apparatus is the same as the moving direction of the own apparatus. To detect.

  The information accumulating unit 518 attaches information indicating the time slot to the distance from the own device detected by the distance detecting unit 516 and the moving direction detected by the direction detecting unit 517, and sequentially repeats a predetermined frame period from the newest one. Accumulate each minute.

  In the transmission time slot determination processing routine according to the fifth embodiment, first, a packet transmission cycle is determined, and a slot that can be shared in the determined transmission cycle is extracted from a plurality of slots. If it is determined that there is a shareable slot, the shared information extracted based on the moving direction and the distance of the surrounding mobile radio communication terminal device 510 stored in the information storage unit 518, as described below. The transmission time slot of the own terminal is determined from the possible slots.

  First, from the extracted sharable slots, a slot in which another mobile radio communication terminal device 510 transmitting a packet whose angle with the moving direction of its own device is within a predetermined range is transmitting a packet is extracted. To do. When there is one extracted slot, the extracted slot is determined as the time slot of the terminal itself. On the other hand, when there are a plurality of extracted slots, the slot from which the other mobile radio communication terminal device 510 having the closest distance to the own device is transmitting a packet is extracted from the extracted slots. The extracted slot is determined as the time slot of the terminal itself.

  Then, a frame of the same timing as the transmission cycle of the mobile radio communication terminal device 510 of the sharing partner, that is, the timing at which the determined time slot is unused in the transmission cycle determined above is used as the frame of the own terminal. decide.

  As described above, since the angle formed with the moving direction of the own device is the moving direction within a predetermined range and the slot can be shared with the surrounding mobile radio communication terminal device closest to the own device, The slot sharing with the mobile radio communication terminal apparatus can be maintained for a long time.

  In the above-described embodiment, a slot is shared with a peripheral mobile radio communication terminal device in the vicinity where the angle formed with the moving direction of the own device is within a predetermined range and the distance from the own device is closest. Although the case has been described as an example, the present invention is not limited to this. The angle formed by the moving direction of the own device is a moving direction within a predetermined range, and the distance from the own device is within the predetermined range. You may make it share a slot with the surrounding mobile radio | wireless communication terminal device which exists.

In the first to fifth embodiments, the case where the transmission cycle for transmitting a packet is 2 ⁿ times the frame cycle has been described as an example. However, the present invention is not limited to this. Alternatively, the transmission period may be a ⁿ times the frame period (n = 0, 1, 2,..., A is a natural number of 2 or more).

It is a block diagram which shows the structure of the mobile radio | wireless communication terminal device which concerns on the 1st Embodiment of this invention. It is the image figure which showed the communication condition observed with each mobile radio | wireless communication terminal device. It is a block diagram which shows the structure of the transmission slot determination part of the mobile radio | wireless communication terminal device which concerns on the 1st Embodiment of this invention. It is an image figure which shows a mode that the slot is shared by the some mobile radio | wireless communication terminal device. It is an image figure which shows the structure of the flame | frame transmitted / received by the mobile radio | wireless communication terminal device which concerns on the 1st Embodiment of this invention. It is a flowchart which shows the content of the determination process routine of the transmission time slot performed in the mobile radio | wireless communication terminal device which concerns on the 1st Embodiment of this invention. It is an image figure which shows a mode that a transmission time slot is determined so that a slot may be shared with another mobile radio | wireless communication terminal device. It is an image figure which shows a mode that the several mobile radio | wireless communication terminal device which moves to the same direction at near speed and near distance shares the same slot. (A) It is an image figure which shows a mode that the frame information for 1 frame period just before packet transmission is transmitted, (B) It is an image figure which shows the frame information which is not transmitted to another mobile radio | wireless communication terminal device. It is a block diagram which shows the structure of the mobile radio | wireless communication terminal device which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows the content of the determination process routine of the transmission time slot performed in the mobile radio | wireless communication terminal device which concerns on the 2nd Embodiment of this invention. It is an image figure which shows a mode that several mobile radio | wireless communication terminal devices which move to the same direction at near speed share the same slot. It is an image figure which shows a mode that several mobile radio | wireless communication terminal devices with a short distance share the same slot. It is a block diagram which shows the structure of the mobile radio | wireless communication terminal device which concerns on the 5th Embodiment of this invention.

Explanation of symbols

10, 210, 510 Mobile radio communication terminal device 11 Reception antenna 12 Reception circuit 15 Frame information generation unit 16 Similarity calculation unit 17 Direction speed detection unit 18, 218, 518 Information storage unit 19 Speed acquisition unit 20 Direction acquisition unit 21, 221 and 521 Transmission slot determination unit 24 Transmission circuit 25 Transmission antenna 30 Shared slot extraction unit 32 Time slot determination unit 34 Transmission period determination unit 216 Position information detection unit 220 Position acquisition unit 516 Distance detection unit 517 Direction detection unit

Claims (13)

A peripheral communication terminal apparatus periodically transmits each of a plurality of slots obtained by time-dividing frames of a predetermined period as a unit, and a ⁿ times the predetermined period related to transmission by the peripheral communication terminal apparatuses (n = 0, 1, 2,..., A is a natural number greater than or equal to 2) and a receiving means for receiving a packet including transmission information indicating a communication status by the plurality of slots;
Peripheral movement direction acquisition means for acquiring the movement direction of the peripheral communication terminal apparatus relative to the movement direction of the own apparatus;
Extraction means for extracting a slot that can be shared with the peripheral communication terminal device from the plurality of slots based on the transmission information of the packet received by the reception means;
Based on the transmission information of the packet received by the reception unit and the movement direction acquired by the peripheral movement direction acquisition unit, the movement direction of the own device among the extracted sharable slots So that a slot in which a packet is transmitted from the peripheral communication terminal device in the moving direction within the predetermined range is shared with the peripheral communication terminal device in the moving direction within the predetermined range. Determining means for determining a slot and a frame for transmitting the packet;
Transmitting means for periodically transmitting the packet to the frame and slot determined by the determining means;
Including a communication terminal device. A peripheral communication terminal apparatus periodically transmits each of a plurality of slots obtained by time-dividing frames of a predetermined period as a unit, and a ⁿ times the predetermined period related to transmission by the peripheral communication terminal apparatuses (n = 0, 1, 2,..., A is a natural number of 2 or more) and includes transmission information indicating the communication status of the plurality of slots, and movement direction information indicating the movement direction of the peripheral communication terminal devices. Receiving means for receiving packets;
Movement direction acquisition means for acquiring the movement direction of the device itself;
Extraction means for extracting a slot that can be shared with the peripheral communication terminal device from the plurality of slots based on the transmission information of the packet received by the reception means;
Based on the transmission information and the movement direction information of the packet received by the reception unit, and the movement direction acquired by the movement direction acquisition unit, the movement among the extracted sharable slots. A slot in which a packet is transmitted from the surrounding communication terminal device in the moving direction within an angle with the moving direction acquired by the direction acquisition means, and the angle between the moving direction within the predetermined range Determining means for determining a slot and a frame for transmitting the packet so as to be shared with peripheral communication terminal devices;
Transmitting means for periodically transmitting the packet to the frame and slot determined by the determining means;
Including a communication terminal device. It further includes speed acquisition means for acquiring the moving speed of the own device,
The receiving means receives the packet including the transmission information, the moving direction information, and moving speed information indicating the moving speed of the surrounding communication terminal device,
The determining means is acquired by the transmission information, the moving direction information, and the moving speed information of the packet received by the receiving means, the moving direction acquired by the moving direction acquiring means, and the speed acquiring means. Of the peripheral communication terminal devices in the direction of movement within which the angle formed by transmitting a packet to the extracted shareable slot is within a predetermined range, by the speed acquisition means. The packet is transmitted so that the slot in which the packet is transmitted from the peripheral communication terminal apparatus having the closest movement speed to the acquired movement speed is shared with the peripheral communication terminal apparatus having the closest movement speed. The communication terminal apparatus according to claim 2, wherein a slot and a frame for determining the frame are determined. It further includes speed acquisition means for acquiring the moving speed of the own device,
The receiving means receives the packet including the transmission information, the moving direction information, and moving speed information indicating the moving speed of the surrounding communication terminal device,
The determining means is acquired by the transmission information, the moving direction information, and the moving speed information of the packet received by the receiving means, the moving direction acquired by the moving direction acquiring means, and the speed acquiring means. Of the peripheral communication terminal devices in the direction of movement within which the angle formed by transmitting a packet to the extracted shareable slot is within a predetermined range, by the speed acquisition means. A slot in which a packet is transmitted from the peripheral communication terminal device whose difference in movement speed is within a predetermined range is shared with the peripheral communication terminal device whose difference is within a predetermined range. The communication terminal apparatus according to claim 2, wherein a slot and a frame for transmitting the packet are determined. A peripheral communication terminal apparatus periodically transmits each of a plurality of slots obtained by time-dividing frames of a predetermined period as a unit, and a ⁿ times the predetermined period related to transmission by the peripheral communication terminal apparatuses (n = 0, 1, 2,..., A is a natural number greater than or equal to 2) and a receiving means for receiving a packet including transmission information indicating a communication status by the plurality of slots;
Peripheral distance acquisition means for acquiring the distance between the own device and the peripheral communication terminal device;
Extraction means for extracting a slot that can be shared with the peripheral communication terminal device from the plurality of slots based on the transmission information of the packet received by the reception means;
Based on the transmission information of the packet received by the receiving unit and the distance acquired by the peripheral distance acquiring unit, the peripheral distance acquiring unit acquires the sharable slot extracted. A slot and a frame for transmitting the packet so that the peripheral communication terminal device having the predetermined distance transmits the packet is shared with the peripheral communication terminal device having the predetermined distance. A determination means for determining
Transmitting means for periodically transmitting the packet to the frame and slot determined by the determining means;
Including a communication terminal device. A peripheral communication terminal apparatus periodically transmits each of a plurality of slots obtained by time-dividing frames of a predetermined period as a unit, and a ⁿ times the predetermined period related to transmission by the peripheral communication terminal apparatuses (n = 0, 1, 2,..., A is a natural number greater than or equal to 2) and a packet including transmission information indicating the communication status of the plurality of slots and position information indicating the positions of the peripheral communication terminal devices. Receiving means for receiving;
Position acquisition means for acquiring the position of the own device;
Extraction means for extracting a slot that can be shared with the peripheral communication terminal device from the plurality of slots based on the transmission information of the packet received by the reception means;
Based on the transmission information and the position information of the packet received by the receiving unit, and the position acquired by the position acquiring unit, the extracted position of the sharable slot is acquired by the position acquiring unit. The packet so that the peripheral communication terminal apparatus at the position where the distance to the determined position is a predetermined distance transmits the packet to the peripheral communication terminal apparatus at the position where the predetermined distance is transmitted. Determining means for determining a slot and a frame for transmitting
Transmitting means for periodically transmitting the packet to the frame and slot determined by the determining means;
Including a communication terminal device.   The determination unit is configured to transmit the packet to the sharable slot extracted from the peripheral communication terminal devices in the vicinity of the position closest to the position acquired by the position acquisition unit. The communication terminal according to claim 6, wherein a slot and a frame for transmitting the packet are determined so that a slot in which the packet is transmitted from the communication terminal apparatus is shared with the peripheral communication terminal apparatus at the nearest position. apparatus.   The determining unit is configured such that, of the peripheral communication terminal devices that are transmitting packets to the extracted sharable slot, the distance from the position acquired by the position acquiring unit is within a predetermined range. 7. A slot and a frame for transmitting the packet are determined so that a slot in which a packet is transmitted from a peripheral communication terminal apparatus is shared with the peripheral communication terminal apparatus at a position within the predetermined range. The communication terminal device described. A peripheral communication terminal apparatus periodically transmits each of a plurality of slots obtained by time-dividing frames of a predetermined period as a unit, and a ⁿ times the predetermined period related to transmission by the peripheral communication terminal apparatuses (n = 0, 1, 2,..., A is a natural number greater than or equal to 2) and a receiving means for receiving a packet including transmission information indicating a communication status by the plurality of slots;
A communication status acquisition means for acquiring a communication status observed in the device by a plurality of slots in the receiving means;
Similarity calculating means for calculating the similarity between the communication status indicated by the transmission information of the packet received by the receiving means and the communication status observed by the own apparatus acquired by the communication status acquiring means;
Extraction means for extracting a slot that can be shared with the peripheral communication terminal device from the plurality of slots based on the transmission information of the packet received by the reception means;
Based on the transmission information of the packet received by the receiving unit and the similarity calculated by the similarity calculating unit, among the extracted sharable slots, the communication status observed by the own device; A slot in which a packet is transmitted from the peripheral communication terminal apparatus that has transmitted the transmission information having a predetermined similarity is shared with the peripheral communication terminal apparatus that has transmitted the transmission information having the predetermined similarity. Determining means for determining a slot and a frame for transmitting the packet;
Transmitting means for periodically transmitting the packet to the frame and slot determined by the determining means;
Including a communication terminal device.   The determining means transmits the transmission information having the highest similarity to the communication status of the own apparatus among the peripheral communication terminal apparatuses that are transmitting packets to the extracted shareable slot. A slot and a frame for transmitting the packet are determined so that a slot in which the packet is transmitted from the communication terminal apparatus is shared with the peripheral communication terminal apparatus that has transmitted the transmission information having the highest similarity. Item 10. The communication terminal device according to Item 9.   The determining means has transmitted the transmission information whose similarity with the communication status of the own apparatus is a predetermined value or more among the peripheral communication terminal apparatuses that are transmitting packets to the extracted shareable slot. A slot and a frame for transmitting the packet so that the slot in which the packet is transmitted from the peripheral communication terminal apparatus is shared with the peripheral communication terminal apparatus that has transmitted the transmission information having the similarity equal to or higher than a predetermined value. The communication terminal device according to claim 9, which determines   Based on the transmission information of the packet received by the receiving means, the extracting means transmits the packet in the same slot as the slot from which the peripheral communication terminal apparatus is transmitting a packet. The transmission cycle and the transmission cycle determined by the own device, and a frame different from the frame in which the peripheral communication terminal device is transmitting a packet and unused. The communication terminal device according to claim 1, wherein a slot is extracted as the shareable slot.   The determining means determines a slot in which a packet is transmitted from the peripheral communication terminal device serving as a sharing partner as a slot for transmitting the packet, and the peripheral communication terminal device serving as the sharing partner is The frame according to any one of claims 1 to 12, wherein a frame in which the determined slot is unused in the same cycle as a transmission cycle in which a packet is transmitted is determined as a frame for transmitting the packet. Communication terminal device.

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